AMD will be releasing a sample CrossFireX driver on Wednesday.

We’ve recieved word that AMD will be sampling a release candidate version of its CrossFireX-compatible drivers starting Wednesday, January 30th. These drivers will enable the use of up to four AMD GPUs on compatible motherboards. Currently the only motherboards that will support four seperate graphics cards in CrossFire are based on AMD’s own 790FX chipset, which is part of the Spider platform.

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Luckily, AMD released the Radeon HD 3870 X2 just yesterday, which supports CrossFireX as well. The advantage of using the HD 3870 X2 is that the card uses only one PCI-E x16 slot, meaning two cards (and four GPUs) can be used in CrossFireX and only require two PCI-E x16 slots, which opens the door to a much larger range of motherboards. Reportedly, most motherboards based on Intel’s X38 and X48 chipset will allow the HD 3870 X2 to run in CrossFireX. Though we have heard no official reports regarding the functionality of CrossFireX on more antiquated chipsets like 975X, P965, and Xpress 3200, we expect they will probably work too (albeit with limited performance due to the lack of two full x16 lanes).

It should be extremely interesting to see how well CrossFireX scales with three and four GPUs. NVIDIA has already demonstrated quad-SLI with a fair amount of success during the GeForce 7950GX2 period. We fully expect to see quad-SLI make another appearence in the first week of March with the launch of the GeForce 9800GX2 and nForce 790i.

With any luck, someone will end up leaking the driver and we will see some benchmark results coming in within a couple of days.

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